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| year | production | consumption |
| 1992 | 3.50 | 85.00 |
| 1993 | 1.40 | 79.00 |
| 1994 | 1.20 | 65.00 |
| 1995 | 1.20 | 31.00 |
| 1996 | .90 | 64.00 |
| 1997 | .60 | 68.00 |
| 1998 | .50 | 68.00 |
| 1999 | .40 | 67.00 |
| 2000 | .50 | 68.00 |
| 2001 | .60 | 71.00 |
| 2002 | .40 | 43.00 |
| 2003 | 1.00 | 26.00 |
| 2004 | 1.00 | 32.00 |
| 2005 | 1.10 | 26.00 |
| 2006 | .90 | 27.00 |
| 2007 | .60 | 27.00 |
| 2008 | 1.10 | 26.00 |
| 2009 | .50 | 23.00 |
| 2010 | .40 | 16.00 |
| 2011 | .40 | 14.00 |
| 2012 | 1.10 | 14.00 |
| 2013 | 1.10 | 14.00 |
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